W. Hackenberg
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View article: Pure-rotational and rotational-vibrational Raman spectrum of the atmosphere at an altitude of 23 km
Pure-rotational and rotational-vibrational Raman spectrum of the atmosphere at an altitude of 23 km Open
Ground-based optical astronomical observations supported by or in the vicinity of laser guide-star systems can be contaminated by Raman-scattered laser photons. Anticipating, alleviating, and correcting for the impact of this self-inflicte…
View article: The GRAVITY+ Project: Towards All-sky, Faint-Science, High-Contrast Near-Infrared Interferometry at the VLTI
The GRAVITY+ Project: Towards All-sky, Faint-Science, High-Contrast Near-Infrared Interferometry at the VLTI Open
The GRAVITY instrument has been revolutionary for near-infrared interferometry by pushing sensitivity and precision to previously unknown limits. With the upgrade of GRAVITY and the Very Large Telescope Interferometer (VLTI) in GRAVITY+, t…
View article: The GRAVITY+ Project: Towards All-sky, Faint-Science, High-Contrast Near-Infrared Interferometry at the VLTI
The GRAVITY+ Project: Towards All-sky, Faint-Science, High-Contrast Near-Infrared Interferometry at the VLTI Open
The GRAVITY instrument has been revolutionary for near-infrared interferometry by pushing sensitivity and precision to previously unknown limits. With the upgrade of GRAVITY and the Very Large Telescope Interferometer (VLTI) in GRAVITY+, t…
View article: CaNaPy: SatComm LGS-AO experimental platform with laser uplink pre-compensation
CaNaPy: SatComm LGS-AO experimental platform with laser uplink pre-compensation Open
FIGURE 9. Ilyocypris salebrosa. A—right valve, external view, female (LBM1430003565). B—right valve, external view, male (LBM1430003564). C—dorsal view of whole carapace, anterior to right, female (LBM1430003566). Scale bar = 448 µm.
View article: Paving the way to daytime optical feeder links based on LGS assisted adaptive optics
Paving the way to daytime optical feeder links based on LGS assisted adaptive optics Open
We report on experiments performed with the Swedish Solar Telescope (SST) located in La Palma (Canary Islands) to observe the sodium Laser Guide Star (LGS) during daytime. The ESO Wendelstein Laser Guide Star Unit 20W CW 589nm laser was us…
View article: Raman-scattered laser guide-star photons to monitor the scatter of astronomical telescope mirrors
Raman-scattered laser guide-star photons to monitor the scatter of astronomical telescope mirrors Open
\nThe first observations of laser guide-star photons that are Raman-scattered by air molecules above the Very Large Telescope (VLT) were reported in June 2017. The initial detection came from the Multi-Unit Spectroscopic Explorer (MUSE) op…
The Adaptive Optics Facility: Commissioning Progress and Results Open
All the Adaptive Optics Facility (AOF) subsystems are now in Paranal and the project team is working on commissioning activities on Unit Telescope 4 (UT4) of the Very Large Telescope. Excellent progress has been made; the new secondary mir…